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What is an auxochrome?

What is an auxochrome? Here are some definitions.

Noun
  1. (chemistry) any atom or group which, when added to a chromophore, causes a bathochromic shift in its spectrum
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Examples
The selenium atom in a cyclic compound also acts like an auxochrome.
While phenyldisulphide is colorless, when an auxochrome group is added, such as NH2, the compound is colored.
In other words, an auxochrome in addition to the chromophore group transforms a colorless chromogen into a colored one.

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